Pre-emulsion and use thereof for the preparation of a hair dyeing composition as well as process for the preparation of a hair dyeing emulsion

Abstract

The invention concerns a pre-emulsion for the simple preparation of a hair dyeing composition, comprising a combination ofa) 20% to 40% by weight of at least one C12-C14-fatty alcohol ethoxylate with 1 to 5 ethylene oxide groups;b) 15% to 40% by weight of oleic acid;c) 10% to 30% by weight of ethanediol and/or 1.2-propanediol distearate;d) 5% to 20% by weight of glyceryl stearate and/or at least one sugar fatty acid ester; and,e) 0% to 25% by weight of at least one C12-C18-fatty alcohol, each calculated to the total pre-emulsion composition; containing no further emulsifiers or fatty substances, having a maximum water content of 10% by weight, in particular 5% by weight, whereby the pH-value is preferably between 7.1 and 9.This pre-emulsion can be mixed at a low temperature with a customary aqueous composition, comprising at least one oxidation dyestuff precursor, to give a stable hair dyeing emulsion.

What is claimed is:  
     
       1. Pre-emulsion for the preparation of a hair dyeing composition, comprising a combination of 
       a) 20% to 40% by weight of at least one C 12 -C 14 -fatty alcohol ethoxylate with 1 to 5 ethylene oxide groups;  
       b) 15% to 40% by weight of oleic acid;  
       c) 10% to 30% by weight of ethanediol and/or 1.2-propanediol distearate;  
       d) 5% to 20% by weight of glyceryl stearate and/or at least one sugar fatty acid ester; and,  
       e) 0% to 25% by weight of at least one C 12 -C 18 -fatty alcohol, each calculated to the total pre-emulsion composition; containing no further emulsifiers or fatty substances, having a maximum water content of 10% by weight, whereby the pH-value is between 7.1 and 9.  
     
     
       2. Pre-emulsion according to claim  1 , comprising as component a) 25% to 35% by weight of a lauryl alcohol ethoxylate with 2 ethylene oxide groups. 
     
     
       3. Pre-emulsion according to claim  1 , comprising 25% to 35% by weight of oleic acid. 
     
     
       4. Pre-emulsion according to claim  1 , comprising 15% to 25% by weight of ethanediol distearate. 
     
     
       5. Pre-emulsion according to claim  1 , comprising as sugar fatty acid ester 5% to 15% by weight of methyl glucose sesquistearate and/or polyglyceryl-3-methyl glucose distearate. 
     
     
       6. Pre-emulsion according to claim  1 , comprising a maximum of 5% by weight of water. 
     
     
       7. Process for the preparation of an emulsion for the dyeing of human hair, wherein a pre-emulsion according to claim  1  is mixed at a maximum temperature of 60°C. with an aqueous composition, comprising at least one oxidation dyestuff precursor.